/Engine/Source/Runtime/Engine/Public/BoneContainer.h
Map compact bone index to skeleton index
the skeleton pose bone index for the specified compact pose bone index. Ensures and returns an invalid index if the skeleton does not include the specified compact pose bone.
[FSkeletonPoseBoneIndex](API\Runtime\AnimationCore\FSkeletonPoseBoneIndex) GetSkeletonPoseIndexFromCompactPoseIndex ( const [FCompactPoseBoneIndex](API\Runtime\AnimationCore\FCompactPoseBoneIndex) & BoneIndex ) const